Method and system for mitigating the effects of pulling in multiple phase locked loops in multi-standard systems

• US 7,869,781 B2
• Filed: 12/29/2006
• Issued: 01/11/2011
• Est. Priority Date: 12/06/2006
• Status: Expired due to Fees

• Current Assignee: Avago Technologies International Sales Pte Limited (Broadcom, Inc.)
• Original Assignee: Broadcom Corporation (Broadcom, Inc.)
• Inventors: Chien, Hung-Ming, Roufoogaran, Razieh, Li, Dandan, Li, Qiang, Behzad, Arya
• Primary Examiner(s): Phu; Sanh D
• Application Number:
  US11/618,716
• Publication Number:
  US 20080139150A1
• Time in Patent Office: 1,474 Days
• Field of Search: 455/230, 455/552.1, 455/285, 455/553.1, 455/207, 455/209, 455/313
• US Class Current: 455/230
• CPC Class Codes: H03L 7/18 using a frequency divider or counter in the loop H03L7/20, H03L7/22 take precedence
• CPC Class Codes: H04B 1/406 with more than one transmission mode, e.g. analog and digital modes
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

Certain aspects of a method and system for mitigating effects of pulling in multiple phase locked loops in multi-standard systems may include selecting an input frequency range of operation at a voltage controlled oscillator based on a particular wireless band of operation in a system that handles a first wireless communication protocol and a second wireless communication protocol. An image rejection mixer may be enabled to generate an output signal for the particular wireless band of operation based on mixing a plurality of received signals within a selected frequency range. An in-phase (I) component and a quadrature (Q) component of the generated output signal may be generated by utilizing a RC-CR quadrature network.

Claims

1. A method for processing signals, the method comprising:

in a system that handles a first wireless communication protocol and a second wireless communication protocol, selecting an input frequency range of operation based on a particular wireless band of operation;

generating an output signal for said particular wireless band of operation based on mixing a plurality of received signals within a selected frequency range; and

generating an in-phase (I) component and a quadrature (Q) component of said generated output signal utilizing at least one quadrature network.

2. The method according to claim 1, comprising selecting said input frequency range of operation at a voltage controlled oscillator based on said particular wireless band of operation.

3. The method according to claim 2, comprising buffering an output signal of said voltage controlled oscillator.

4. The method according to claim 3, comprising coupling a first divider circuit to said buffered output signal of said voltage controlled oscillator.

5. The method according to claim 4, comprising communicating a first generated I component signal and a first generated Q component signal from said first divider circuit to at least one image rejection mixer.

6. The method according to claim 5, comprising coupling a second divider circuit to said first generated I component signal from said first divider circuit.

7. The method according to claim 6, comprising communicating a second generated I component signal and a second generated Q component signal from said second divider circuit to said at least one image rejection mixer.

8. The method according to claim 7, comprising mixing said buffered output signal of said voltage controlled oscillator with one of the following:

said first generated I component signal and said second generated I component signal to generate said output signal for 802.11a wireless band of operation.

9. The method according to claim 8, comprising communicating said generated output signal for 802.11a wireless band of operation to said at least one quadrature network.

10. The method according to claim 5, comprising coupling a third divider circuit to said first generated Q component signal from said first divider circuit.

11. The method according to claim 10, comprising communicating a third generated I component signal and a third generated Q component signal from said third divider circuit to said at least one image rejection mixer.

12. The method according to claim 11, comprising coupling a fourth divider circuit to said third generated I component signal from said third divider circuit.

13. The method according to claim 12, comprising coupling a dummy load to a Q component output signal of said third divider circuit, wherein said dummy load comprises a load that is equivalent to said fourth divider circuit.

14. The method according to claim 13, comprising communicating a fourth generated I component signal and a fourth generated Q component signal from said fourth divider circuit to said at least one image rejection mixer.

15. The method according to claim 14, comprising mixing said first generated I component signal with at least one of the following:

said third generated I component signal and said fourth generated I component signal to generate said output signal for one of the following;

802.11b and 802.11g wireless band of operation.

16. The method according to claim 15, comprising communicating said generated output signal for one of the following:

802.11b and 802.11g wireless band of operation to said at least one quadrature network.

17. The method according to claim 1, wherein said at least one quadrature network comprises a plurality of resistors and capacitors.

18. The method according to claim 1, wherein said first wireless communication protocol is a Bluetooth wireless communication protocol.

19. The method according to claim 1, wherein said second wireless communication protocol is a wireless LAN communication protocol.

20. The method according to claim 1, wherein said first wireless communication protocol and said second wireless communication protocol is handled by circuitry integrated on a single chip.

21. The method according to claim 1, wherein each of said first wireless communication protocol and said second wireless communication protocol is handled by circuitry integrated on separate chips.

23. The system according to claim 2, wherein said one or more circuits enables selection of said input frequency range of operation at a voltage controlled oscillator based on said particular wireless band of operation.

24. The system according to claim 23, wherein said one or more circuits enables buffering of an output signal of said voltage controlled oscillator.

25. The system according to claim 24, wherein said one or more circuits enables coupling of a first divider circuit to said buffered output signal of said voltage controlled oscillator.

26. The system according to claim 25, wherein said one or more circuits enables communication of a first generated I component signal and a first generated Q component signal from said first divider circuit to at least one image rejection mixer.

27. The system according to claim 26, wherein said one or more circuits enables coupling of a second divider circuit to said first generated I component signal from said first divider circuit.

28. The system according to claim 27, wherein said one or more circuits enables communication of a second generated I component signal and a second generated Q component signal from said second divider circuit to said at least one image rejection mixer.

29. The system according to claim 28, wherein said at least one image rejection mixer enables mixing of said buffered output signal of said voltage controlled oscillator with one of the following:

said first generated I component signal and said second generated I component signal to generate said output signal for 802.11a wireless band of operation.

30. The system according to claim 29, wherein said one or more circuits enables communication of said generated output signal for 802.11a wireless band of operation to said at least one quadrature network.

31. The system according to claim 26, wherein said one or more circuits enables coupling of a third divider circuit to said first generated Q component signal from said first divider circuit.

32. The system according to claim 31, wherein said one or more circuits enables communication of a third generated I component signal and a third generated Q component signal from said third divider circuit to said at least one image rejection mixer.

33. The system according to claim 32, wherein said one or more circuits enables coupling of a fourth divider circuit to said third generated I component signal from said third divider circuit.

34. The system according to claim 33, wherein said one or more circuits enables coupling of a dummy load to a Q component output signal of said third divider circuit, wherein said dummy load comprises a load that is equivalent to said fourth divider circuit.

35. The system according to claim 34, wherein said one or more circuits enables communication of a fourth generated I component signal and a fourth generated Q component signal from said fourth divider circuit to said at least one image rejection mixer.

36. The system according to claim 35, wherein said at least one image rejection mixer enables mixing of said first generated I component signal with one of the following:

said third generated I component signal and said fourth generated I component signal to generate said output signal for at least one of the following;

802.11b and 802.11g wireless band of operation.

37. The system according to claim 36, wherein said one or more circuits enables communication of said generated output signal for one of the following:

802.11b and 802.11g wireless band of operation to said at least one quadrature network.

22. A system for processing signals, the system comprising:

one or more circuits for use within a system that handles a first wireless communication protocol and a second wireless communication protocol, said one or more circuits enables selection of an input frequency range of operation based on a particular wireless band of operation;

said one or more circuits enables generation of an output signal for said particular wireless band of operation based on mixing a plurality of received signals within a selected frequency range; and

said one or more circuits enables generation of an in-phase (I) component and a quadrature (Q) component of said generated output signal utilizing at least one quadrature network.

38. The system according to claim 22, wherein said at least one quadrature network comprises a plurality of resistors and capacitors.

39. The system according to claim 22, wherein said first wireless communication protocol is a Bluetooth wireless communication protocol.

40. The system according to claim 22, wherein said second wireless communication protocol is a wireless LAN communication protocol.

41. The system according to claim 22, wherein said first wireless communication protocol and said second wireless communication protocol is handled by circuitry integrated on a single chip.

42. The system according to claim 22, wherein each of said first wireless communication protocol and said second wireless communication protocol is handled by circuitry integrated on separate chips.

43. The system according to claim 22, wherein said one or more circuits comprises an image rejection mixer.

44. The system according to claim 43, wherein said image rejection mixer enables mixing of said plurality of received signals within said selected frequency range based on said particular wireless band of operation.